I remember there being talk of eventually being able to call Julia from within Python. I've also been quite happy using Numba as an alternative to Cython for some things when I need speed. It's a lot more light-weight with less boilerplate, although still a little rough around the edges.
I don't know about calling Julia from within Python, but you can call python from within Julia. This makes it very easy to wrap and use python libraries for things which Julia doesn't have good support for yet.
